MacOS10.15.4 or Later Shows Legacy System Extension Alert against old Version of KasperskymacOS 10.15.4 or later version will alert Legacy System Extension issue i.e. incompatibility on previous version of Kaspersky Endpoint Security (as captured below). Kaspersky Endpoint Security for Mac Version 11.0.1.753 can fix this issue. If you have installed previous version of Kaspersky Endpoint Security, please follow the user guide of Kaspersky Endpoint Security for Mac (Version 11.0.1.753, English) to upgrade your Kaspersky Endpoint Security software.